crypto/dso/dso_win32.c

   1 /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63
  64 #if !defined(DSO_WIN32)
  65 DSO_METHOD *DSO_METHOD_win32(void)
  66         {
  67         return NULL;
  68         }
  69 #else
  70
  71 #ifdef _WIN32_WCE
  72 # if _WIN32_WCE < 300
  73 static FARPROC GetProcAddressA(HMODULE hModule,LPCSTR lpProcName)
  74         {
  75         WCHAR lpProcNameW[64];
  76         int i;
  77
  78         for (i=0;lpProcName[i] && i<64;i++)
  79                 lpProcNameW[i] = (WCHAR)lpProcName[i];
  80         if (i==64) return NULL;
  81         lpProcNameW[i] = 0;
  82
  83         return GetProcAddressW(hModule,lpProcNameW);
  84         }
  85 # endif
  86 # undef GetProcAddress
  87 # define GetProcAddress GetProcAddressA
  88 #endif
  89
  90 /* Part of the hack in "win32_load" ... */
  91 #define DSO_MAX_TRANSLATED_SIZE 256
  92
  93 static int win32_load(DSO *dso);
  94 static int win32_unload(DSO *dso);
  95 static void *win32_bind_var(DSO *dso, const char *symname);
  96 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
  97 #if 0
  98 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
  99 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 100 static int win32_init(DSO *dso);
 101 static int win32_finish(DSO *dso);
 102 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 103 #endif
 104 static char *win32_name_converter(DSO *dso, const char *filename);
 105 static char *win32_merger(DSO *dso, const char *filespec1,
 106         const char *filespec2);
 107 static int win32_pathbyaddr(void *addr,char *path,int sz);
 108
 109 static const char *openssl_strnchr(const char *string, int c, size_t len);
 110
 111 static DSO_METHOD dso_meth_win32 = {
 112         "OpenSSL 'win32' shared library method",
 113         win32_load,
 114         win32_unload,
 115         win32_bind_var,
 116         win32_bind_func,
 117 /* For now, "unbind" doesn't exist */
 118 #if 0
 119         NULL, /* unbind_var */
 120         NULL, /* unbind_func */
 121 #endif
 122         NULL, /* ctrl */
 123         win32_name_converter,
 124         win32_merger,
 125         NULL, /* init */
 126         NULL, /* finish */
 127         win32_pathbyaddr
 128         };
 129
 130 DSO_METHOD *DSO_METHOD_win32(void)
 131         {
 132         return(&dso_meth_win32);
 133         }
 134
 135 /* For this DSO_METHOD, our meth_data STACK will contain;
 136  * (i) a pointer to the handle (HINSTANCE) returned from
 137  *     LoadLibrary(), and copied.
 138  */
 139
 140 static int win32_load(DSO *dso)
 141         {
 142         HINSTANCE h = NULL, *p = NULL;
 143         /* See applicable comments from dso_dl.c */
 144         char *filename = DSO_convert_filename(dso, NULL);
 145
 146         if(filename == NULL)
 147                 {
 148                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 149                 goto err;
 150                 }
 151         h = LoadLibraryA(filename);
 152         if(h == NULL)
 153                 {
 154                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 155                 ERR_add_error_data(3, "filename(", filename, ")");
 156                 goto err;
 157                 }
 158         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 159         if(p == NULL)
 160                 {
 161                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 162                 goto err;
 163                 }
 164         *p = h;
 165         if(!sk_push(dso->meth_data, (char *)p))
 166                 {
 167                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 168                 goto err;
 169                 }
 170         /* Success */
 171         dso->loaded_filename = filename;
 172         return(1);
 173 err:
 174         /* Cleanup !*/
 175         if(filename != NULL)
 176                 OPENSSL_free(filename);
 177         if(p != NULL)
 178                 OPENSSL_free(p);
 179         if(h != NULL)
 180                 FreeLibrary(h);
 181         return(0);
 182         }
 183
 184 static int win32_unload(DSO *dso)
 185         {
 186         HINSTANCE *p;
 187         if(dso == NULL)
 188                 {
 189                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 190                 return(0);
 191                 }
 192         if(sk_num(dso->meth_data) < 1)
 193                 return(1);
 194         p = (HINSTANCE *)sk_pop(dso->meth_data);
 195         if(p == NULL)
 196                 {
 197                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 198                 return(0);
 199                 }
 200         if(!FreeLibrary(*p))
 201                 {
 202                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 203                 /* We should push the value back onto the stack in
 204                  * case of a retry. */
 205                 sk_push(dso->meth_data, (char *)p);
 206                 return(0);
 207                 }
 208         /* Cleanup */
 209         OPENSSL_free(p);
 210         return(1);
 211         }
 212
 213 /* Using GetProcAddress for variables? TODO: Check this out in
 214  * the Win32 API docs, there's probably a variant for variables. */
 215 static void *win32_bind_var(DSO *dso, const char *symname)
 216         {
 217         HINSTANCE *ptr;
 218         void *sym;
 219
 220         if((dso == NULL) || (symname == NULL))
 221                 {
 222                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 223                 return(NULL);
 224                 }
 225         if(sk_num(dso->meth_data) < 1)
 226                 {
 227                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 228                 return(NULL);
 229                 }
 230         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 231         if(ptr == NULL)
 232                 {
 233                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 234                 return(NULL);
 235                 }
 236         sym = GetProcAddress(*ptr, symname);
 237         if(sym == NULL)
 238                 {
 239                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 240                 ERR_add_error_data(3, "symname(", symname, ")");
 241                 return(NULL);
 242                 }
 243         return(sym);
 244         }
 245
 246 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 247         {
 248         HINSTANCE *ptr;
 249         void *sym;
 250
 251         if((dso == NULL) || (symname == NULL))
 252                 {
 253                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 254                 return(NULL);
 255                 }
 256         if(sk_num(dso->meth_data) < 1)
 257                 {
 258                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 259                 return(NULL);
 260                 }
 261         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 262         if(ptr == NULL)
 263                 {
 264                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 265                 return(NULL);
 266                 }
 267         sym = GetProcAddress(*ptr, symname);
 268         if(sym == NULL)
 269                 {
 270                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 271                 ERR_add_error_data(3, "symname(", symname, ")");
 272                 return(NULL);
 273                 }
 274         return((DSO_FUNC_TYPE)sym);
 275         }
 276
 277 struct file_st
 278         {
 279         const char *node; int nodelen;
 280         const char *device; int devicelen;
 281         const char *predir; int predirlen;
 282         const char *dir; int dirlen;
 283         const char *file; int filelen;
 284         };
 285
 286 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 287         int assume_last_is_dir)
 288         {
 289         struct file_st *result = NULL;
 290         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 291         const char *start = filename;
 292
 293         if (!filename)
 294                 {
 295                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 296                 /*goto err;*/
 297                 return(NULL);
 298                 }
 299
 300         result = OPENSSL_malloc(sizeof(struct file_st));
 301         if(result == NULL)
 302                 {
 303                 DSOerr(DSO_F_WIN32_SPLITTER,
 304                         ERR_R_MALLOC_FAILURE);
 305                 return(NULL);
 306                 }
 307
 308         memset(result, 0, sizeof(struct file_st));
 309         position = IN_DEVICE;
 310
 311         if(filename[0] == '\\' && filename[1] == '\\'
 312                 || filename[0] == '/' && filename[1] == '/')
 313                 {
 314                 position = IN_NODE;
 315                 filename += 2;
 316                 start = filename;
 317                 result->node = start;
 318                 }
 319
 320         do
 321                 {
 322                 switch(filename[0])
 323                         {
 324                 case ':':
 325                         if(position != IN_DEVICE)
 326                                 {
 327                                 DSOerr(DSO_F_WIN32_SPLITTER,
 328                                         DSO_R_INCORRECT_FILE_SYNTAX);
 329                                 /*goto err;*/
 330                                 return(NULL);
 331                                 }
 332                         result->device = start;
 333                         result->devicelen = filename - start;
 334                         position = IN_FILE;
 335                         start = ++filename;
 336                         result->dir = start;
 337                         break;
 338                 case '\\':
 339                 case '/':
 340                         if(position == IN_NODE)
 341                                 {
 342                                 result->nodelen = filename - start;
 343                                 position = IN_FILE;
 344                                 start = ++filename;
 345                                 result->dir = start;
 346                                 }
 347                         else
 348                                 {
 349                                 filename++;
 350                                 result->dirlen += filename - start;
 351                                 }
 352                         break;
 353                 case '\0':
 354                         if(position == IN_NODE)
 355                                 {
 356                                 result->nodelen = filename - start;
 357                                 }
 358                         else
 359                                 {
 360                                 if(filename - start > 0)
 361                                         {
 362                                         if (assume_last_is_dir)
 363                                                 {
 364                                                 result->devicelen += filename - start;
 365                                                 }
 366                                         else
 367                                                 {
 368                                                 result->file = start;
 369                                                 result->filelen = filename - start;
 370                                                 }
 371                                         }
 372                                 }
 373                         break;
 374                 default:
 375                         filename++;
 376                         break;
 377                         }
 378                 }
 379         while(*filename);
 380
 381         if(!result->nodelen) result->node = NULL;
 382         if(!result->devicelen) result->device = NULL;
 383         if(!result->dirlen) result->dir = NULL;
 384         if(!result->filelen) result->file = NULL;
 385
 386         return(result);
 387         }
 388
 389 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 390         {
 391         int len = 0, offset = 0;
 392         char *result = NULL;
 393         const char *start;
 394
 395         if(!file_split)
 396                 {
 397                 DSOerr(DSO_F_WIN32_JOINER,
 398                                 ERR_R_PASSED_NULL_PARAMETER);
 399                 return(NULL);
 400                 }
 401         if(file_split->node)
 402                 {
 403                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 404                 if(file_split->predir || file_split->dir || file_split->file)
 405                         len++;  /* 1 for ending \ */
 406                 }
 407         else if(file_split->device)
 408                 {
 409                 len += file_split->devicelen + 1; /* 1 for ending : */
 410                 }
 411         len += file_split->predirlen;
 412         if(file_split->predir && (file_split->dir || file_split->file))
 413                 {
 414                 len++;  /* 1 for ending \ */
 415                 }
 416         len += file_split->dirlen;
 417         if(file_split->dir && file_split->file)
 418                 {
 419                 len++;  /* 1 for ending \ */
 420                 }
 421         len += file_split->filelen;
 422
 423         if(!len)
 424                 {
 425                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 426                 return(NULL);
 427                 }
 428
 429         result = OPENSSL_malloc(len + 1);
 430         if (!result)
 431                 {
 432                 DSOerr(DSO_F_WIN32_JOINER,
 433                         ERR_R_MALLOC_FAILURE);
 434                 return(NULL);
 435                 }
 436
 437         if(file_split->node)
 438                 {
 439                 strcpy(&result[offset], "\\\\"); offset += 2;
 440                 strncpy(&result[offset], file_split->node,
 441                         file_split->nodelen); offset += file_split->nodelen;
 442                 if(file_split->predir || file_split->dir || file_split->file)
 443                         {
 444                         result[offset] = '\\'; offset++;
 445                         }
 446                 }
 447         else if(file_split->device)
 448                 {
 449                 strncpy(&result[offset], file_split->device,
 450                         file_split->devicelen); offset += file_split->devicelen;
 451                 result[offset] = ':'; offset++;
 452                 }
 453         start = file_split->predir;
 454         while(file_split->predirlen > (start - file_split->predir))
 455                 {
 456                 const char *end = openssl_strnchr(start, '/',
 457                         file_split->predirlen - (start - file_split->predir));
 458                 if(!end)
 459                         end = start
 460                                 + file_split->predirlen
 461                                 - (start - file_split->predir);
 462                 strncpy(&result[offset], start,
 463                         end - start); offset += end - start;
 464                 result[offset] = '\\'; offset++;
 465                 start = end + 1;
 466                 }
 467         if(file_split->predir && (file_split->dir || file_split->file))
 468                 {
 469                 result[offset] = '\\'; offset++;
 470                 }
 471         start = file_split->dir;
 472         while(file_split->dirlen > (start - file_split->dir))
 473                 {
 474                 const char *end = openssl_strnchr(start, '/',
 475                         file_split->dirlen - (start - file_split->dir));
 476                 if(!end)
 477                         end = start
 478                                 + file_split->dirlen
 479                                 - (start - file_split->dir);
 480                 strncpy(&result[offset], start,
 481                         end - start); offset += end - start;
 482                 result[offset] = '\\'; offset++;
 483                 start = end + 1;
 484                 }
 485         if(file_split->dir && file_split->file)
 486                 {
 487                 result[offset] = '\\'; offset++;
 488                 }
 489         strncpy(&result[offset], file_split->file,
 490                 file_split->filelen); offset += file_split->filelen;
 491         result[offset] = '\0';
 492         return(result);
 493         }
 494
 495 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 496         {
 497         char *merged = NULL;
 498         struct file_st *filespec1_split = NULL;
 499         struct file_st *filespec2_split = NULL;
 500
 501         if(!filespec1 && !filespec2)
 502                 {
 503                 DSOerr(DSO_F_WIN32_MERGER,
 504                                 ERR_R_PASSED_NULL_PARAMETER);
 505                 return(NULL);
 506                 }
 507         if (!filespec2)
 508                 {
 509                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 510                 if(!merged)
 511                         {
 512                         DSOerr(DSO_F_WIN32_MERGER,
 513                                 ERR_R_MALLOC_FAILURE);
 514                         return(NULL);
 515                         }
 516                 strcpy(merged, filespec1);
 517                 }
 518         else if (!filespec1)
 519                 {
 520                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 521                 if(!merged)
 522                         {
 523                         DSOerr(DSO_F_WIN32_MERGER,
 524                                 ERR_R_MALLOC_FAILURE);
 525                         return(NULL);
 526                         }
 527                 strcpy(merged, filespec2);
 528                 }
 529         else
 530                 {
 531                 filespec1_split = win32_splitter(dso, filespec1, 1);
 532                 if (!filespec1_split)
 533                         {
 534                         DSOerr(DSO_F_WIN32_MERGER,
 535                                 ERR_R_MALLOC_FAILURE);
 536                         return(NULL);
 537                         }
 538                 filespec2_split = win32_splitter(dso, filespec2, 0);
 539                 if (!filespec1_split)
 540                         {
 541                         DSOerr(DSO_F_WIN32_MERGER,
 542                                 ERR_R_MALLOC_FAILURE);
 543                         OPENSSL_free(filespec1_split);
 544                         return(NULL);
 545                         }
 546
 547                 /* Fill in into filespec1_split */
 548                 if (!filespec1_split->node && !filespec1_split->device)
 549                         {
 550                         filespec1_split->node = filespec2_split->node;
 551                         filespec1_split->nodelen = filespec2_split->nodelen;
 552                         filespec1_split->device = filespec2_split->device;
 553                         filespec1_split->devicelen = filespec2_split->devicelen;
 554                         }
 555                 if (!filespec1_split->dir)
 556                         {
 557                         filespec1_split->dir = filespec2_split->dir;
 558                         filespec1_split->dirlen = filespec2_split->dirlen;
 559                         }
 560                 else if (filespec1_split->dir[0] != '\\'
 561                         && filespec1_split->dir[0] != '/')
 562                         {
 563                         filespec1_split->predir = filespec2_split->dir;
 564                         filespec1_split->predirlen = filespec2_split->dirlen;
 565                         }
 566                 if (!filespec1_split->file)
 567                         {
 568                         filespec1_split->file = filespec2_split->file;
 569                         filespec1_split->filelen = filespec2_split->filelen;
 570                         }
 571
 572                 merged = win32_joiner(dso, filespec1_split);
 573                 }
 574         return(merged);
 575         }
 576
 577 static char *win32_name_converter(DSO *dso, const char *filename)
 578         {
 579         char *translated;
 580         int len, transform;
 581
 582         len = strlen(filename);
 583         transform = ((strstr(filename, "/") == NULL) &&
 584                         (strstr(filename, "\\") == NULL) &&
 585                         (strstr(filename, ":") == NULL));
 586         if(transform)
 587                 /* We will convert this to "%s.dll" */
 588                 translated = OPENSSL_malloc(len + 5);
 589         else
 590                 /* We will simply duplicate filename */
 591                 translated = OPENSSL_malloc(len + 1);
 592         if(translated == NULL)
 593                 {
 594                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 595                                 DSO_R_NAME_TRANSLATION_FAILED);
 596                 return(NULL);
 597                 }
 598         if(transform)
 599                 sprintf(translated, "%s.dll", filename);
 600         else
 601                 sprintf(translated, "%s", filename);
 602         return(translated);
 603         }
 604
 605 static const char *openssl_strnchr(const char *string, int c, size_t len)
 606         {
 607         size_t i;
 608         const char *p;
 609         for (i = 0, p = string; i < len && *p; i++, p++)
 610                 {
 611                 if (*p == c)
 612                         return p;
 613                 }
 614         return NULL;
 615         }
 616
 617 #include <tlhelp32.h>
 618 #ifdef _WIN32_WCE
 619 # define DLLNAME "TOOLHELP.DLL"
 620 #else
 621 # ifdef MODULEENTRY32
 622 # undef MODULEENTRY32   /* unmask the ASCII version! */
 623 # endif
 624 # define DLLNAME "KERNEL32.DLL"
 625 #endif
 626
 627 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 628 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 629 typedef BOOL (WINAPI *MODULE32)(HANDLE, MODULEENTRY32 *);
 630
 631 static int win32_pathbyaddr(void *addr,char *path,int sz)
 632         {
 633         HMODULE dll;
 634         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 635         MODULEENTRY32 me32;
 636         CREATETOOLHELP32SNAPSHOT create_snap;
 637         CLOSETOOLHELP32SNAPSHOT  close_snap;
 638         MODULE32 module_first, module_next;
 639         int len;
 640
 641         if (addr == NULL)
 642                 {
 643                 union   { int(*f)(void*,char*,int); void *p; } t =
 644                         { win32_pathbyaddr };
 645                 addr = t.p;
 646                 }
 647
 648         dll = LoadLibrary(TEXT(DLLNAME));
 649         if (dll == NULL)
 650                 {
 651                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 652                 return -1;
 653                 }
 654
 655         create_snap = (CREATETOOLHELP32SNAPSHOT)
 656                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 657         if (create_snap == NULL)
 658                 {
 659                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 660                 return -1;
 661                 }
 662         /* We take the rest for granted... */
 663 #ifdef _WIN32_WCE
 664         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 665                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 666 #else
 667         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 668 #endif
 669         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 670         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 671
 672         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 673         if( hModuleSnap == INVALID_HANDLE_VALUE )
 674                 {
 675                 FreeLibrary(dll);
 676                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 677                 return -1;
 678                 }
 679
 680         me32.dwSize = sizeof(me32);
 681
 682         if(!(*module_first)(hModuleSnap,&me32))
 683                 {
 684                 (*close_snap)(hModuleSnap);
 685                 FreeLibrary(dll);
 686                 DSOerr(DSO_F_PATHBYADDR,DSO_R_FAILURE);
 687                 return -1;
 688                 }
 689
 690         do      {
 691                 if ((BYTE *)addr >= me32.modBaseAddr &&
 692                     (BYTE *)addr <  me32.modBaseAddr+me32.modBaseSize)
 693                         {
 694                         (*close_snap)(hModuleSnap);
 695                         FreeLibrary(dll);
 696 #ifdef _WIN32_WCE
 697 # if _WIN32_WCE >= 101
 698                         return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
 699                                                         path,sz,NULL,NULL);
 700 # else
 701                         len = (int)wcslen(me32.szExePath);
 702                         if (sz <= 0) return len+1;
 703                         if (len >= sz) len=sz-1;
 704                         for(i=0;i<len;i++)
 705                                 path[i] = (char)me32.szExePath[i];
 706                         path[len++] = 0;
 707                         return len;
 708 # endif
 709 #else
 710                         len = (int)strlen(me32.szExePath);
 711                         if (sz <= 0) return len+1;
 712                         if (len >= sz) len=sz-1;
 713                         memcpy(path,me32.szExePath,len);
 714                         path[len++] = 0;
 715                         return len;
 716 #endif
 717                         }
 718                 } while((*module_next)(hModuleSnap, &me32));
 719
 720         (*close_snap)(hModuleSnap);
 721         FreeLibrary(dll);
 722         return 0;
 723         }
 724 #endif /* DSO_WIN32 */